diff --git a/core/tests/Drupal/KernelTests/Core/Theme/StableDecoupledTest.php b/core/tests/Drupal/KernelTests/Core/Theme/StableDecoupledTest.php
deleted file mode 100644
index dd43487b152d..000000000000
--- a/core/tests/Drupal/KernelTests/Core/Theme/StableDecoupledTest.php
+++ /dev/null
@@ -1,317 +0,0 @@
-<?php
-
-namespace Drupal\KernelTests\Core\Theme;
-
-use Drupal\KernelTests\KernelTestBase;
-
-/**
- * Tests that themes do not depend on Stable assets.
- *
- * These tests exist to facilitate the process of decoupling theme from Stable.
- * The decoupling process includes:
- *   1. Identifying Stable assets that differ from core ones
- *   2. Of those differing assets, identify those that are inherited by
- *     the themes being tested.
- *   3. Determine if a copy of that Stable asset must be added to the theme,
- *     or if it's acceptable for the theme to inherit the more recent version
- *     of the asset from core.
- * This test will identify these assets and confirm that the theme has properly
- * decoupled itself from them by either having a theme-specific copy of the
- * asset, or it being determined that it's acceptable for the theme to use
- * core's version (in which case it will be skipped by this test).
- *
- * @group Theme
- */
-class StableDecoupledTest extends KernelTestBase {
-
-  /**
-   * Populates an array with CSS and templates used within a given directory.
-   *
-   * @param string[] &$assets
-   *   Modified parameter, an array of asset filenames.
-   * @param string $path
-   *   The path being checked.
-   */
-  protected function getAssets(array &$assets, $path) {
-    $directory = new \RecursiveDirectoryIterator($path, \FilesystemIterator::CURRENT_AS_FILEINFO | \FilesystemIterator::SKIP_DOTS);
-    $iterator = new \RecursiveIteratorIterator($directory);
-    foreach ($iterator as $fileinfo) {
-      if ($fileinfo->getExtension() !== 'twig' && $fileinfo->getExtension() !== 'css') {
-        continue;
-      }
-      $filename = $fileinfo->getFilename();
-      $filepath = $fileinfo->getPathname();
-      // Tests can have assets with the same filename, so skip assets in those
-      // directories.
-      if (strpos($filepath, '/test') === FALSE) {
-        $assets[$filename] = file_get_contents($filepath);
-      }
-    }
-  }
-
-  /**
-   * Returns a list of asset filenames that are actually different in Stable.
-   *
-   * @return string[]
-   *   Filenames of Stable assets that differ form their core equivalents.
-   */
-  protected function assetsThatDifferInStable() {
-    static $non_identical_files = [];
-    if (!empty($non_identical_files)) {
-      return $non_identical_files;
-    }
-    $core_assets = [];
-    $stable_assets = [];
-    $non_identical_files = [];
-
-    $this->getAssets($core_assets, 'core/modules');
-    $this->getAssets($core_assets, 'core/misc');
-    $this->getAssets($stable_assets, 'core/themes/stable');
-
-    // Assets that are in core but not Stable.
-    $in_core_only = array_diff(array_keys($core_assets), array_keys($stable_assets));
-
-    // Files that are included in Stable but never loaded by core themes. This
-    // files file.admin.css and filter.admin.css were removed in core so
-    // Stable's libraries-override never replaces them with core's version. The
-    // simpletest-result-summary.html.twig template is skipped because the
-    // Simpletest module was removed from core.
-    $in_stable_but_never_loaded = [
-      'file.admin.css',
-      'filter.admin.css',
-      'simpletest-result-summary.html.twig',
-    ];
-
-    // Files related to normalize.css can be skipped. These files are related to
-    // the core/normalize library and not inherited in the same manner.
-    $normalize_css_assets = ['normalize.css', 'normalize-fixes.css'];
-
-    // Create an array of skippable asset files.
-    $assets_to_skip = array_merge($in_core_only, $in_stable_but_never_loaded, $normalize_css_assets);
-
-    foreach ($stable_assets as $filename => $stable_asset_contents) {
-      if (in_array($filename, $assets_to_skip)) {
-        continue;
-      }
-
-      $core_asset_contents = $core_assets[$filename];
-
-      // Most of the remaining logic in this loop is replacing expected
-      // differences between assets so the string comparison only surfaces
-      // functional differences between the two.
-      // Off canvas and layout builder CSS have different relative paths to
-      // image files than all other CSS files being tested.
-      if (strpos($filename, 'off-canvas') !== FALSE) {
-        $core_asset_contents = str_replace('(../icons', '(../../../images/core/icons', $core_asset_contents);
-      }
-      elseif (strpos($filename, 'layout-builder') !== FALSE || strpos($filename, 'settings_tray') !== FALSE) {
-        $core_asset_contents = str_replace('../misc', '../../misc', $core_asset_contents);
-      }
-      else {
-        $core_asset_contents = str_replace('(../../../../misc/', '(../../../images/core/', $core_asset_contents);
-        $core_asset_contents = str_replace('(../../../misc/', '(../../images/core/', $core_asset_contents);
-      }
-
-      // Account for several additional differences between core assets and the
-      // Stable equivalents.
-      $before = [
-        '* Default theme implementation',
-        'Default template for',
-        "*\n * @ingroup themeable\n */",
-        "*\n* @ingroup themeable\n*/",
-        'Default theme override',
-        'Default view template',
-        "* Theme override of a container used to wrap the media library's\n * modal dialog interface.",
-      ];
-      $after = [
-        '* Theme override',
-        'Theme override for',
-        '*/',
-        '*/',
-        'Theme override',
-        'Theme override',
-        "* Theme override of a container used to wrap the media library's modal dialog\n * interface.",
-      ];
-      $core_asset_contents = str_replace($before, $after, $core_asset_contents);
-
-      // Account for the module-specific subdirectories used by Stable CSS
-      // files that consume image files.
-      foreach (['shortcut', 'quickedit', 'color', 'views_ui', 'image'] as $module) {
-        $stable_asset_contents = str_replace("/../images/$module/", '/images/', $stable_asset_contents);
-      }
-
-      // If the asset contents still differ after being changed to account for
-      // expected differences between core and stable, they are not identical
-      // and should be added to the array returned by this method.
-      if ($stable_asset_contents !== $core_asset_contents) {
-        $non_identical_files[] = $filename;
-      }
-    }
-
-    return $non_identical_files;
-  }
-
-  /**
-   * Confirms that theme assets are decoupled from Stable.
-   *
-   * @param string $path
-   *   The path to the theme being tested.
-   * @param string[] $to_skip
-   *   Assets to skip in the test.
-   *
-   * @dataProvider providerTestDecoupledStable
-   */
-  public function testDecoupledStable($path, array $to_skip) {
-    $assets = [];
-
-    // Get a list of asset files that differ between core and Stable.
-    $files_to_check = $this->assetsThatDifferInStable();
-
-    // Get all non-test .twig and .css assets within $path.
-    $this->getAssets($assets, $path);
-
-    // Of the assets to check, exclude any that appear within the theme being
-    // tested as that means they're already overridden. Also exclude those
-    // listed in $to_skip.
-    $files_inherited_from_stable = array_diff($files_to_check, array_keys($assets), $to_skip);
-    $this->assertEmpty($files_inherited_from_stable);
-  }
-
-  /**
-   * Data provider.
-   *
-   * The to-skip arrays should become increasingly smaller as issues that
-   * address Stable library dependencies are completed.
-   *
-   * @return array[]
-   *   Themes and the asset filenames to be ignored.
-   */
-  public function providerTestDecoupledStable() {
-    return [
-      'claro' => [
-        'path' => 'core/themes/claro',
-        'to-skip' => [
-          // The changes in the core version have acceptable results.
-          'block.admin.css',
-          // The only difference is to address an issue with normalize.css 3.0.3
-          // that is fixed by updating to version 8.0.1.
-          // @see https://drupal.org/node/2821525
-          'filter.caption.css',
-          // The only difference is overridden in Claro CSS.
-          'progress.module.css',
-          // This template is not used by core themes.
-          'status-report.html.twig',
-          // We've intentionally left system.admin.css broken in stable.
-          // @see https://drupal.org/node/3033734
-          'system.admin.css',
-          // The following two templates can be skipped as the only difference
-          // is the removal of an unnecessary data-striping attribute in core's
-          // version.
-          'system-modules-details.html.twig',
-          'system-modules-uninstall.html.twig',
-        ],
-      ],
-      'seven' => [
-        'path' => 'core/themes/seven',
-        'to-skip' => [
-          // The changes in the core version have acceptable results.
-          'block.admin.css',
-          // The only difference is to address an issue with normalize.css 3.0.3
-          // that is fixed by updating to version 8.0.1.
-          // @see https://drupal.org/node/2821525
-          'filter.caption.css',
-          // The only difference is overridden in Seven CSS.
-          'progress.module.css',
-          // This template is not used by core themes.
-          'status-report.html.twig',
-          // The difference is a desired markup change.
-          // @see https://drupal.org/node/3113211
-          'views-ui-views-listing-table.html.twig',
-          // We've intentionally left system.admin.css broken in stable.
-          // @see https://drupal.org/node/3033734
-          'system.admin.css',
-          // The following two templates can be skipped as the only difference
-          // is the removal of an unnecessary data-striping attribute in core's
-          // version.
-          'system-modules-details.html.twig',
-          'system-modules-uninstall.html.twig',
-        ],
-      ],
-      'bartik' => [
-        'path' => 'core/themes/bartik',
-        'to-skip' => [
-          // The only difference is overridden in Bartik CSS.
-          'container-inline.module.css',
-          // The only difference is overridden in Bartik CSS.
-          'progress.module.css',
-          // The changes are acceptable as Bartik is not an admin theme.
-          'block.admin.css',
-          // The only difference is to address an issue with normalize.css 3.0.3
-          // that is fixed by updating to version 8.0.1.
-          // @see https://drupal.org/node/2821525
-          'filter.caption.css',
-          // The only difference is a desired markup change.
-          // @see https://drupal.org/node/2528420
-          'install-page.html.twig',
-          // This template is not used by core themes.
-          'status-report.html.twig',
-          // The differences in Stable vs. core are acceptable ones.
-          'status-report-counter.html.twig',
-          // The only difference is one column of inconsequential whitespace.
-          'status-report-general-info.html.twig',
-          // The differences in Stable vs. core are acceptable ones.
-          'system-status-counter.css',
-          // We've intentionally left system.admin.css broken in stable.
-          // @see https://drupal.org/node/3033734
-          'system.admin.css',
-          // The difference is a desired markup change.
-          // @see https://drupal.org/node/3113211
-          'views-ui-views-listing-table.html.twig',
-          // The following two templates can be skipped as the only difference
-          // is the removal of an unnecessary data-striping attribute in core's
-          // version.
-          'system-modules-details.html.twig',
-          'system-modules-uninstall.html.twig',
-        ],
-      ],
-      'umami' => [
-        'path' => 'core/profiles/demo_umami/themes/umami',
-        'to-skip' => [
-          // The only difference is overridden in Umami CSS.
-          'container-inline.module.css',
-          // The only difference is overridden in Umami CSS.
-          'progress.module.css',
-          // The changes are acceptable as Umami is not an admin theme.
-          'block.admin.css',
-          // The only difference is to address an issue with normalize.css 3.0.3
-          // that is fixed by updating to version 8.0.1.
-          // @see https://drupal.org/node/2821525
-          'filter.caption.css',
-          // The only difference is a desired markup change.
-          // @see https://drupal.org/node/2528420
-          'install-page.html.twig',
-          // This template is not used by core themes.
-          'status-report.html.twig',
-          // The differences in Stable vs. core are acceptable ones.
-          'status-report-counter.html.twig',
-          // The only difference is one column of inconsequential whitespace.
-          'status-report-general-info.html.twig',
-          // The differences in Stable vs. core are acceptable ones.
-          'system-status-counter.css',
-          // We've intentionally left system.admin.css broken in stable.
-          // @see https://drupal.org/node/3033734
-          'system.admin.css',
-          // The difference is a desired markup change.
-          // @see https://drupal.org/node/3113211
-          'views-ui-views-listing-table.html.twig',
-          // The following two templates can be skipped as the only difference
-          // is the removal of an unnecessary data-striping attribute in core's
-          // version.
-          'system-modules-details.html.twig',
-          'system-modules-uninstall.html.twig',
-        ],
-      ],
-    ];
-  }
-
-}